William gleason



@uitrit faire gamut-'frn WILLI-AM GLEASON,` OF ROCHESTER, NEW YORK.

Letters Patent No. 70,830, dated NovemberlZ, 1867. i i

IMPROVBD, Toon-nner.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, WILLIAM GLEASON, of Rochester, in the county ofMonroe, and State of New York, have invented a new and useful Rest vfor-the ToollHolder ot' Engine-Lathes, and I do hereby declare that thefollowing is a full, clear, and exact description thereof, referencebeing had to the accompanying drawing, lmaking part of this specication,in which the figure is a vertical central-section of my invention.

This invention relates to that class of engine-lathes in which it isimpracticable to use Aa weighted tool-rest; and its nature consists inproviding a rest for the tool-holder of such lathes, which will permitthe tool to be raised or lowered, as may be desired, and withoutloosening it in the holder, v

To enable others to make and use my invention, I will describe itsconstruction and operation.

I make the sliding bed 'A in the ordinary way, except the addition of avertical hole in the centre, for .the

reception of the clamping-swivel V. There is a hole drilled in one side,large enough to receive the eccentric portion C of-the clamping-shaft Y,the outer end of which is squared to take the wrench W, the hole beingmade with a smaller dr i1l beyond the swivel, for. the journal-bearingfor the inner end of the clamping-shaft. The outer bearingis formed by'the blushing b, which is secured in placeby the set-screw a. There is around seaton the upper face of the sliding hed A, to receive the annularrotary gauge G, which is firmly secured to,

the bed by the annular plate P, and a series of clamping-screws, S. ThegaugeGr is provided inside with one or more turns of a coarsescrew-thread or inclined plane, e. Above this thread is a rim, r, madeto tit loosely in the groove d of the rest D when it is lowered, and bythis means the dustaud dirt are preventedfrom enter-V ing the workingjoints. The rest is threaded to t the thread in the gaugering G. Thecentre of the rest Dis bored out and threaded, as shown, to fit thethread .I on theuppcr end ofthe clamping-screw S. Both of these threads,e and J, are right-hand threads, but the lower end ot' theclamping-screw is provided with a left-hand thread, f, correspondingwith that 'in the top of the clamping-swivel or nut V. `The lead of thethreads J and f should equal that ofthe thread e. The necessity ofthis', it will be seen, is owing Ato the fact that the clamping-screw Sis made to turn with the gauge-ring G by means of-,the lever-pin E,which lits snugly in the ring at g, and through the stem of the screw S,wheile it is allowed alittle vertical play. When the ring G and screw Sare lgiven a full turn in the direction to raise the tool-rest D, thcscrew will be raised as much as the lead of the threadsf, consequentlythat elevation must be compensated for by a corresponding diminution inthe' lead of the threads J. The parallelism of the rest D withl thesliding bod A is maintained by means of thc bolt F, which is screwedfirmly into the rest, and is nicely litted into the bed A, as shown. Thegauge-ring G can only he turned one revolution less the diameter oi' thebolt E. The ring may he turned by inserting the end h of the wrench Winto one of the holes c, there being several provided in the ring. Whenthedesired elevation or depression of the tool or cutter is obtained,tho parts are iirmly bound together by turningthe cam or eccentric Cdown. '.lhc plug-screw n closes lthe oil-hole for the inside screw, SLC.'.lhcsc tool-rests are attached to the lathes in the ordinary manner,and `may be easily applied to those already in usc. -Any slack orlooseness that might occur from wear between the parts, may bccompensated for by removing the pin E and giving a half turn or more tothe screw S. Instead of' the screwf, that end of the screw S may beswivelled Yto the clamping-nut Vhy a halved screw-collar. The eccentricclamp C may he dispensed with by substituting a taper pin or key to bindor clamp the parts firmly together when the desired set of thecutting-tool is obtained.

What I'claim as my invention, and desire to secure by Letters Patent,isl l.. The employment of thc triple-screw system, substantially asherein set for'th, for the purpose of adjusting vertically thecutting-tool of engine-lathes without loosening it. f

' 2. The arrangement of the eccentric clamping-shaft Y,-in connectionwith the clamping-Screw S and rest D, substantially in the manner hereinshown and described, and for the purposes set forth.

WILLIAM GLEASON.

Witnesses:

WM. S. Louennonoucn, A. H. BILLINGs.

